What are some differences between observational studies and experiments, and what issues may arise during data collection or interpretation?

Question

jim_thompson5910 · Answer

`What are some differences between observational studies and experiments` this should help answer the first part http://www.public.iastate.edu/~dnett/S401/nexpvsobs.pdf

jim_thompson5910 · Answer

I'm not 100% sure about the second part

`what issues may arise during data collection or interpretation?`

I'm assuming they want you to respond and talk about some sort of bias. One way to do that is to not do a random sample and only pick the data points you want. That will skew the data.